{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances, UndecidableInstances #-}------------------------------------------------------------------------------------ Copyright (C) 2008 Martin Sulzmann, Edmund Lam. All rights reserved.{-
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-}moduleMultiSetRewrite.RuleSyntaxwhere{-
Describes external syntax of rules and translation to internal form
-}---------------------------------------------------------------------- Representation of receive clauses -- pattern clauses are of the form-- pat_clause := pat* (.\. pat*)? (when guard)? -- pat := message-- guard := IO Bool-- receive clauses are of the form-- rec_clause := pat_clause ".->." body---------------------------------------------------------------------- Translation to internal form-- internal form of match tasksdataMatchTaska=Propa|Simpa|Guard(IOBool)-- we immediately turn each pattern clause into a list of match tasks(.->.)xy=(convertHeadx,y)(.\.)xy=(x,y)dataWITHGUARDa=WITHGUARDa(IOBool)whenxy=WITHGUARDxyinfixr4.->.infixr5.\.classConvertHeadab|a->bwhereconvertHead::a->[MatchTaskb]-- Simp/Prop caseinstanceConvertHead([a],[a])awhereconvertHead(xs,ys)=(mapPropxs)++(mapSimpys)-- only Simp caseinstanceConvertHead[a]awhereconvertHeadxs=mapSimpxs-- additional guardinstanceConvertHeadba=>ConvertHead(WITHGUARDb)awhereconvertHead(WITHGUARDxy)=(convertHeadx)++[Guardy]